The same problem also affects fixed-line telecoms networks, as broadband infrastructure is upgraded from copper wires to optical fibres and new equipment is installed to handle larger volumes of data.
随着宽带网络基础设施从铜线升级到光缆，和处理为处理大批量数据使用新设备，同样的问题也困扰着有线电信网络。
The Jubilee line, one of the more recent additions on the network, has been upgraded to suit its role as the main tube route to Stratford.
银禧线是地铁网络中最新增加的线路之一，经过改善已成为通往斯特拉特福德的主要地铁线。
The bottom line: Don't buy more machine than you can afford, or need. But protect yourself by getting one that can be upgraded to the new operating systems.
底线：不要购买超出自己购买能力或者需要之外的电脑。但要确保你所购置的电脑可以升级到新版操作系统。(实习编辑：顾萍)。
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